Dual condensation cure silicone

Abstract

Dual condensation cure silicone systems are described. Such systems include hydroxyl-functional(s), hydride-functional silane(s), platinum catalyst(s) and Ti(W) complex(es). Systems including alkoxy-functional crosslinker(s) are also described. Articles, including adhesive articles included the cured reaction product of such dual condensation cure silicone systems are also described.

1 . A composition comprising (a) one or more silicone polymers, the one or more silicone polymers comprising at least one silanol-functional polyorganosiloxane and at least one hydride-functional silane, (b) a platinum catalyst, and (c) a Ti(IV) complex. 
     
     
         2 . The composition of  claim 1 , further comprising an alkoxy-functional silane crosslinker. 
     
     
         3 . The composition of  claim 2 , wherein the alkoxy-functional silane crosslinker is selected from the group consisting of divinyldiethoxysilane, triethoxysilane, tetraethoxysilane, bis(triethoxysilyl)ethane, and combinations thereof. 
     
     
         4 . The composition of  claim 1 , wherein the platinum catalyst comprises at least one of a Pt(0) complex, a Pt(II) complex, and a Pt(IV) complex. 
     
     
         5 . The composition of  claim 4 , wherein the platinum catalyst comprises at least one Pt(0) complex. 
     
     
         6 . The dual cure silicone system of  claim 5 , wherein the platinum catalyst comprises bis(1,3-divinyl-1,1,3,3-tetramethyldisiloxane) platinum(0). 
     
     
         7 . The composition of  claim 1 , wherein the Ti(IV) complex is selected from the group consisting of titanium(IV) 2-ethylhexoxide, titanium di-n-butoxide(bis-2,4-pentanedionate), titanium(IV) isopropoxide, titanium(IV) n-butoxide, titanium(IV) ethoxide, titanium(IV) diisopropoxide bis(ethylacetoacetate), titanium(IV) diisopropoxide (bis-2,4-pentanedionate), and combinations thereof. 
     
     
         8 . The composition of  claim 7 , wherein the Ti(IV) complex comprises titanium (IV)-2-ethylhexoxide. 
     
     
         9 . The composition of  claim 1 , wherein composition comprises two or more different silanol-functional polyorganosiloxanes. 
     
     
         10 . An article comprising a crosslinked silicone layer, the crosslinked silicone layer comprising reaction product of the composition of  claim 1 . 
     
     
         11 . The article of  claim 10 , further comprising a substrate, wherein the crosslinked silicone layer covers at least a portion of a first surface of the substrate. 
     
     
         12 . The article of  claim 11 , further comprising an adhesive layer, wherein the adhesive layer covers at least a portion of the crosslinked silicone layer.